Definitely saved a lot - I got in the AZ YYZ-LCA J class deal for 3 people, JAL ICN-JFK F class deal, HX SFO-BKK J class deal.
As all these trips would have gone anyway, those alone are savings of some $13,000.
And this is where i learned about SQ's FEZSQ and CEZSQ - I don't know how many of those I did over the years, but again
savings in the 5 figure range.